This page explains in detail the interactions between the K-On series and the Taiko no Tatsujin series.
Taiko no Tatsujin: Session de Dodon ga Don! - Donder Pack Vol.12[]
September 27, 2018
K-On
Taiko no Tatsujin
Taiko no Tatsujin: Session de Dodon ga Don! - Donder Pack Vol.12 features the music track "Connect" from K-On.